Do you use an electric space heater? Is your stove all electric or gas? A gas with electric pilot could use steadily. Another possible culprit - how old is your refrigerator? Side-by-sides are very inefficient, and the older ones especially. Any old fridge will use lots of electric. Assuming all your lighting is Led bulbs but if not, switch them out, you will see savings the next bill. Also big-screen tvs suck energy, consider putting on a power strip and turn of at the strip.